PROBLEM TO BE SOLVED: To enable the reduction of surface area of open curtains which have been gathered up which blocks sunlight.SOLUTION: A greenhouse 30 comprises an outer shell 20 and a curtain system 10. The curtain system 10 is provided with a first curtain 11 and a second curtain 12 which can be opened and closed between a deployed state and a gathered-up state in a section intersecting the longer direction of the outer shell 20. The first curtain 11 has a first fixed end part 111 that remains at a fixed position in the central part of the outer shell 20 and a first moveable end part 112 that can move between the central part of the outer shell 20 and a first peripheral part. The second curtain 12 has a second fixed end part 121 that remains at a fixed position in the central part of the outer shell 20 and a second moveable end part 122 that can move between the central part of the outer shell 20 and a second peripheral part at the opposite side to the first peripheral part. When the first curtain 11 is in the gathered-up state and the second curtain 12 is in the gathered-up state, the first curtain 11 and the second curtain 12 are aligned vertically.SELECTED DRAWING: Figure 1【課題】カーテンを開けた収束状態において太陽光を遮る面積を低減可能にする。【解決手段】農業用ハウス３０は、外殻２０とカーテンシステム１０を備える。カーテンシステム１０は、外殻２０の長手方向に交差する断面において展開状態と収束状態との間で開閉可能である第１カーテン１１および第２カーテン１２を備える。第１カーテン１１は、第１固定端部１１１が外殻２０の中央部の定位置に留まり、第１可動端部１１２が外殻２０の中央部と第１の周部との間で移動可能である。第２カーテン１２は、第２固定端部１２１が外殻２０の中央部の定位置に留まり、第２可動端部１２２が外殻２０の中央部と第１の周部の反対側である第２の周部との間で移動可能である。第１カーテン１１が収束状態であり、かつ第２カーテン１２の収束状態である場合に、第１カーテン１１と第２カーテン１２とが上下に並ぶ。【選択図】図１
